Collaborative Research: CDI-Type II--Revolutionary Advances in Modeling Transport Phenomena in Porous Medium Systems

国家的供水、地下能源开采、温室气体储存、全球气候变化、生物组织、混凝土材料和燃料电池设计都是涉及天然和工程多孔介质系统的关键领域的例子。尽管多孔介质过程的广泛发生和重要性，建模的基本方法，虽然建立完善，几乎普遍使用，是严重缺陷。随着越来越复杂的问题需要可靠的模拟器，这些缺陷变得更加重要。这些缺陷包括：（a）多相流和输运的熟知的微观尺度物理学与宏观尺度上这些过程的建模之间的脱节;（B）依赖准静态假设来描述诸如相对渗透率和毛细管压力之类的量，即使对于动态效应很重要的系统也是如此;（c）缺乏有条理、严格、理论框架，其中守恒方程和热力学关系可以建立一般和专门的应用;以及（d）在能量传输、分散和相相互作用的闭合方案中缺乏物理现实性。最终的结果是，多孔介质系统的研究需要结合理论，计算和数学分析的转型研究，以产生严格的，多尺度的，基于物理的模型，需要在广泛而重要的科学学科的应用中提高模拟的理解和可靠性。该项目将结合联合收割机理论，计算，数学分析和高分辨率的实验观察，制定，解决和验证模型，捕捉多相流的物理和传输现象在多孔介质跨越一系列的长度尺度。多管齐下的方法将为新一代多孔介质模型奠定基础，该模型将适用于涉及自然和工程系统的广泛科学领域。一般基础工作将通过对三个重要问题的具体研究来说明：非稀释密度相关传输、双流体相流动和三流体相流动。在这项工作中集成的工具将包括孔隙结构和流体分布的高分辨率成像，图像分析和数据提取，流体和固体的连续介质力学，经典和扩展热力学，多尺度分析，高分辨率格子玻尔兹曼算法开发和模拟，新模型的数学分析，时间和空间自适应数值方法，和先进的积分方法求解系统的非线性偏微分代数方程。该项目将通过短期课程、学生研究和科学推广为教育做出贡献。 它将通过制作一本专著和分发用于多孔介质建模和分析的工具，加强跨学科基础多孔介质研究的基础设施。该项目将鼓励代表性不足的研究人员的参与，并与少数民族招聘计划挂钩。它将有助于改善我们管理自然资源和工程多孔系统的各种应用。

The nation's water supply, subsurface energy extraction, storage of greenhouse gases, global climate change, biological tissues, concrete materials, and fuel cell design are all examples of critical areas involving natural and engineered porous medium systems. Despite the widespread occurrence and importance of porous medium processes, the basic approach to modeling them, although well-established and nearly universally used, is seriously flawed. The flaws have become more consequential with the need for reliable simulators of increasingly complex problems. These flaws include: (a) a disconnect between well-understood microscale physics of multiphase flow and transport and the modeling of these processes at the macroscale; (b) reliance upon quasi-static assumptions to describe quantities such as relative permeability and capillary pressure even for systems where dynamic effects are important; (c) lack of a methodical, rigorous, theoretical framework within which conservation equations and thermodynamic relations can be established for general and specialized applications; and (d) a lack of physical realism in closure schemes for energy transport, dispersion, and phase interactions. The end result is that the study of porous medium systems requires transformational research combining theory, computation, and mathematical analysis to produce the rigorous, multiscale, physics-based models needed to advance understanding and reliability of simulations in applications across a broad and important range of scientific disciplines. This project will combine theory, computation, mathematical analysis, and high-resolution experimental observation to formulate, solve, and validate models that capture the physics of multiphase flow and transport phenomena in porous media across a range of length scales. The multi-pronged approach will produce the foundational underpinnings of a new generation of porous medium models that will apply across a wide range of scientific fields involving both natural and engineered systems. The general foundational work will be illustrated by specific study of three important problems: non-dilute density dependent transport, two-fluidphase flow, and three-fluid-phase flow. The tools integrated in this work will include high-resolution imaging of pore structure and fluid distributions, image analysis and data extraction, continuum mechanics of fluids and solids, classical and extended thermodynamics, multiscale analysis, high-resolution lattice-Boltzmann algorithm development and simulation, mathematical analysis of new models, time and space adaptive numerical methods, and advanced integral methods for solving systems of nonlinear partial differential algebraic equations. This project will contribute to education through short courses, student research, and science outreach. It will enhance the infrastructure for fundamental porous media research across disciplines through the production of a monograph and the distribution of tools for modeling and analysis of porous media. The project will encourage the participation of underrepresented researchers and has linkages to minority recruitment programs. It will help improve our to manage natural resources and engineer porous systems for a variety of applications.